Posts Tagged ‘abrasive grit’

Just like before, check all stones for flaws. Set aside any that may need to be tumbled again. Stones that are ready go into the tumbler; add filler to 2/3 full. Abrasive and water are the same. The 600 grit should be used. This should take about 7 days. Check after 24 hours and then after 3 days. 1 to 1 1/2 teaspoons of dry flake detergent may also be added.

After these steps, your stones should be ready for polishing. Cerium Oxide and Tin Oxide are two of the most common all-purpose polishes. Check your stones to see if they are ready to polish by using a polishing buff or wheel. If you have access to any “local knowledge” about the particular stones you are tumbling, they should be able to recommend which polish will work best for the stones

Fill the tumbler approximately 2/3 full of stones. Add abrasive. 80 Grit is a popular choice. Stones that are very rough may require a coarser grit. 8 to 10 pounds of rock will take 3/4 to 1 cup of grit. You can add 1/2 teaspoon of baking soda to cut down on gas buildup. Filler can be added (plastic pellets) to help carry the abrasive between the stones. Add water, enough to cover the rocks. Start the tumbler. Check progress after 24 hours and then every 2 to 3 days after that. The first grind should take between 6 and 8 days. After you are satisfied with the first grind, wash and dry the stones completely before beginning the next step. All rough grit must be removed from the stones.